export function switchNav () {
    let type = false
    var browser = {
        versions: function() {
          var u = navigator.userAgent;
          return {
                  trident: u.indexOf('Trident') > -1, //IE内核
                  presto: u.indexOf('Presto') > -1, //opera内核
                  webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核
                  gecko: u.indexOf('Firefox') > -1, //火狐内核Gecko
                  mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
                  ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios
                  android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android
                  iPhone: u.indexOf('iPhone') > -1 , //iPhone
                  iPad: u.indexOf('iPad') > -1, //iPad
                  webApp: u.indexOf('Safari') > -1 //Safari
              };
          }()
      }
      if (browser.versions.mobile || browser.versions.ios || browser.versions.android || browser.versions.iPhone || browser.versions.iPad) {
          type = true
      }

      return type
}